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Using the .NET JIT to reduce abstraction overhead

March 1, 2022

I ran into this recently and I thought that this technique would make a great post. We are using that extensively inside of RavenDB to reduce the overhead of abstractions while not limiting our capabilities. It is probably best that I’ll start with an example. We have a need to perform some action, which needs to be specialized by the caller. For…

Podcasts

RavenDB: a Really Boring Database! with Dejan Miličić

February 28, 2022

Listen to Dejan Miličić’s talk with Coding After Work about why boring is good when it comes to databases, and how RavenDB does its best to avoid problems and stay out of your way

Blog

Performance optimizations in production

February 28, 2022

Date range queries can be quite expensive for RavenDB. Consider the following query: from index ‘Users/Search’ where search(DisplayName, “Oren”) and CreationDate between “2008-10-13T07:18:01.623” and “2018-10-13T07:18:01.623” include timings() The root issue is that we have a compound query here, we use full text search on the left but then need…

Articles

Database Revision Control – The Database Time Machine

February 25, 2022

Using Database Document Revisions and Revert Revisions for most recovery tasks Though DBAs are not necessarily famous for their shy vocabulary, the worst word they may utter remains the small “oops…” that follows their realization that an erroneous operation, say a wrong patch or query, has wreaked havoc in the database. A sigh of relief may…

data-storage nosql-database

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RavenDB: Domain Modeling and Data Persistency

February 25, 2022

Dejan Miličić is talking with André Baltieri about data modeling and data…

Blog

Badly implementing encryption: Part X-Additional data

February 24, 2022

This series has been going on quite a bit longer than I intended it to be. Barring any new developments or questions, I think that this will be the last post I’ll write on the topic. In a previous post, I implemented authenticated encryption, ensuring that we’ll be able to clearly detect if the ciphertext we got has been modified along the way.…

Articles

At a Glance: Graphical User Interfaces (GUIs) of MongoDB, CouchDB, and RavenDB

February 23, 2022

Intro CouchDB’s Fauxton MongoDB’s Compass MongoDB’s Studio 3T RavenDB Studio It’s the busiest night of the year, and your whole website just crashed. Is the network down? Is a server on fire? Is it caused by faulty business logic, or maybe a rare race condition? During development, it took hours to diagnose a problem. The boss…

nosql-database

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Badly implementing encryption: Part IX–SIV

February 23, 2022

I mentioned in a previous post that nonce reuse is a serious problem. It is enough to reuse a nonce even once and you can have catastrophic results at your hands. The problem occurs, interestingly enough, when we are able to capture two separate messages generated with the same key & nonce. If we capture the same message twice, that is not an…

Blog

Badly implementing encryption: Part VIII–timings attacks and side channels

February 22, 2022

In the previous post, I showed some code that compared two MAC values (binary buffers) and I mentioned that the manner in which I did that was bad. Here is the code in question: When you are looking at code that is used in a cryptographic context, you should be aware that any call that compares buffers (or strings) cannot short circuit. What do…